The Grand Hotel of the Universe has a warning that it was "Out of Bounds" to British personnel. There is also a sign to say that it was "Off Limits" to U.S. Forces. As this is set in 1941, there wouldn't have been any U.S. Forces until November 1942.
The German armoured car found at the oasis is actually a British-made FV603 Alvis Saracen with extended bodywork to cover the turret. The vehicle was in service with the British army from 1952 until withdrawal in Northern Ireland in 1991.
Liz Fraser has said in interviews that the cast went on strike at one point.
Some small part actors are dubbed by Donald Pleasence.
Opening credits: All characters and events in this film are fictitious. Any similarity to actual events or persons, living or dead, is purely coincidental.